<?php
	header("Content-type:text/html;charset=utf-8");
	if(isset($_POST['con'])){
		$con = $_POST['con'];
		echo htmlspecialchars(strip_tags($con));
	}
?>
<form method="post">
	content:<textarea name="con"></textarea>	<br/>
	<button type="submit">submit</button>
</form>